fix(storybook): fix the argTypes.weekStart.mapping on Datepicker.stories.tsx

[ktanoooo]

• I have followed the Your First Code Contribution section of the Contributing guide

When you click Datepicker on the storybook, throws an invalid time value error.
I guess it is because the default value of weekStart arg becomes string Sunday by the argTypes.weekStart.mapping. The weekStart arg is expected the number.
This PR fixed the value of argTypes.weekStart.mapping to be only the string key.

- argTypes.weekStart.mapping: { 0: "Sunday", 1: "Monday", 2: "Tuesday", 3: "Wednesday", 4: "Thursday", 5: "Friday", 6: "Saturday", Sunday: 0, Monday: 1, Tuesday: 2, Wednesday: 3, Thursday: 4, Friday: 5, Saturday: 6 }
+ argTypes.weekStart.mapping: { Sunday: 0, Monday: 1, Tuesday: 2, Wednesday: 3, Thursday: 4, Friday: 5, Saturday: 6 }

fix #1167

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (7461173) 99.54% compared to head (7bf4f8a) 97.38%.
Report is 192 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1254      +/-   ##
==========================================
- Coverage   99.54%   97.38%   -2.17%     
==========================================
  Files         163      216      +53     
  Lines        6621     9217    +2596     
  Branches      401      538     +137     
==========================================
+ Hits         6591     8976    +2385     
- Misses         30      241     +211     

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[SutuSebastian]

nice